public class demo1 {
    public static void main(String[] args) {
        //+
        System.out.println(3+2);
        //-
        System.out.println(5-2);
        //*
        System.out.println(6/2);
        //在计算时候有小数参与
        System.out.println(1.1+2.01);
    }
}
